TY - JOUR AU - Cynthia Chappell AU - Pablo Okhuysen AU - Charles Sterling AU - Constance Wang AU - Walter Jakubowski AU - Herbert Dupont BT - The American journal of tropical medicine and hygiene LA - eng PY - 1999 EP - 157–164 T2 - The American journal of tropical medicine and hygiene TI - Infectivity of Cryptosporidium parvum in healthy adults with pre-existing anti-C. parvum serum immunoglobulin G. VL - 60 ER -